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Athens

$371+ Cheap flights from Ontario (ONT) to Athens (ATH)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Jun 19 — Jun 261
Fri 6/19
Fri 6/26
1 adult, Economy
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Cheap flight deals from Ontario to Athens

Cheapest flights from Ontario to Athens
Explore the most affordable flight options available from Ontario to Athens. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 20, 2026.

This United Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/141:18 pm
ONT
-
ATH
2 stops23h 47m
United Airlines
Wed 9/2312:10 pm
ATH
-
ONT
2 stops42h 06m
United Airlines
Deal found 5/20$802
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:00 am
ONT
-
ATH
1 stop18h 00m
Delta
Wed 9/169:45 am
ATH
-
ONT
1 stop22h 11m
Delta
Deal found 5/18$814
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:59 pm
ONT
-
ATH
2 stops22h 51m
Delta
Tue 9/2910:05 am
ATH
-
ONT
2 stops32h 56m
Delta
Deal found 5/18$819
This KLM deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:05 am
ONT
-
ATH
1 stop17h 55m
KLM
Tue 9/112:10 pm
ATH
-
ONT
1 stop19h 46m
KLM
Deal found 5/16$820
This United Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Tue 9/16:55 am
ATH
-
ONT
2 stops23h 06m
United Airlines
Deal found 5/19$825
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
ONT
-
ATH
2 stops19h 00m
Delta
Wed 9/166:00 am
ATH
-
ONT
2 stops20h 14m
Delta
Deal found 5/18$829
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:59 pm
ONT
-
ATH
2 stops24h 36m
Delta
Thu 11/2611:45 am
ATH
-
ONT
2 stops33h 42m
Delta
Deal found 5/18$831
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:59 pm
ONT
-
ATH
2 stops24h 36m
Delta
Fri 11/276:05 am
ATH
-
ONT
2 stops20h 07m
Delta
Deal found 5/18$835
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/217:00 am
ONT
-
ATH
2 stops40h 35m
Delta
Wed 11/2511:45 am
ATH
-
ONT
2 stops33h 42m
Delta
Deal found 5/18$836
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/217:00 am
ONT
-
ATH
2 stops40h 35m
Delta
Fri 11/276:05 am
ATH
-
ONT
2 stops27h 43m
Delta
Deal found 5/18$840
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2210:59 pm
ONT
-
ATH
2 stops48h 36m
Delta
Thu 11/2611:45 am
ATH
-
ONT
2 stops33h 42m
Delta
Deal found 5/18$843
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2210:59 pm
ONT
-
ATH
2 stops48h 36m
Delta
Fri 11/276:05 am
ATH
-
ONT
2 stops20h 07m
Delta
Deal found 5/18$847

Find flight deals from Ontario to Athens

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Athens (ATH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$802
(United Airlines)

One-way from

$371
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$707
Provider with most accurate pricing for Ontario-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Athens Eleftherios V. flights.
Search Deals
From Ontario to Athens Eleftherios V.
Search Deals
One-way flight from Ontario to Athens Eleftherios V.
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Athens that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 20, 2026.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 8/19

6:00 am-11:00 am

2 stops19h 00m

Athens Eleftherios V.

Wed 9/16

9:45 am-9:56 pm

1 stop22h 11m

$825

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 8/19

9:01 am-2:55 pm

2 stops19h 54m

Athens Eleftherios V.

Fri 9/18

6:45 am-7:17 pm

2 stops22h 32m

$869

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 9/7

7:00 am-11:00 am

1 stop18h 00m

Athens Eleftherios V.

Wed 9/16

9:45 am-6:01 pm

1 stop18h 16m

$986

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 7/12

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Wed 7/22

9:45 am-6:23 pm

1 stop18h 38m

$986

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 7/6

5:34 am-11:45 am

1 stop20h 11m

Athens Eleftherios V.

Tue 7/14

2:00 pm-10:32 pm

1 stop18h 32m

$1,323

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 9/14

9:10 pm-2:50 pm

2 stops31h 40m

Athens Eleftherios V.

Tue 9/29

3:40 pm-8:13 pm

2 stops38h 33m

$1,329
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 6/11

7:05 am-10:00 am

1 stop16h 55m

Athens Eleftherios V.

Sat 9/5

9:45 am-6:01 pm

1 stop18h 16m

$1,383

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 7/21

7:00 am-11:45 am

1 stop18h 45m

Athens Eleftherios V.

Sun 8/2

2:00 pm-11:59 pm

1 stop19h 59m

$1,393

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 6/18

10:00 pm-11:00 am

1 stop27h 00m

Athens Eleftherios V.

Tue 9/15

9:45 am-6:01 pm

1 stop18h 16m

$1,398

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 7/21

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 7/30

9:45 am-6:23 pm

1 stop18h 38m

$1,567

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/19

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Ontario to Athens

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Athens in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Athens flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Athens flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Athens flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Athens flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Athens flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Athens

Have a flexible travel schedule? Discover the best time to fly to Athens from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Athens

How much does it cost to fly round-trip from Ontario to Athens?

Reviews of airlines servicing Athens

Get insights into the airlines that provide service to Athens. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Athens. Reviews last updated May 20, 2026.
Read reviews from past customers who have flown United Airlines from Ontario to Athens. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,737 reviews

Comfort

7.3

Overall

7.4

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,737 reviews
United Airlines
7.4
Good
9,737 reviews

Comfort

7.3

Overall

7.4

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Athens. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Athens?

    Airlines like United Airlines, KLM, and British Airways fly from Ontario to Athens in about 18h. The time it takes to get you to your destination can typically vary by up to 1h 54m. Ontario and Athens are separated by a distance of 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ontario to Athens round-trip?

    According to our current data, United Airlines ($588), offers the cheapest pricing from Ontario to Athens. United Airlines is priced at 25% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Ontario to Athens that include hotel bookings?

    Yes. In addition to deals on Ontario to Athens flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Athens?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Athens.

  • Can I find deals for business class flights from Ontario to Athens?

    Yes. Cheapflights offers flight deals from Ontario to Athens by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Glyfada
Tolo
Galaxidi
Piraeus

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Top airline flying from Ontario to Athens

Discover the top airline that operate flights from Ontario to Athens. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$823FlexibilityNo cancel feeOn-time69%

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